Battery charger



FIG. 1 is a front perspective view of a battery charger showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a left side elevational view thereof the other side being a mirror image. 

The ornamental design for a battery charger, as shown and described. 